"During Friday, increasingly frequent snow showers already affecting parts of Scotland, Northern Ireland and northern England will extend across many other northern and western parts of the United Kingdom", said the Met Office.
Met Office meteorologist John West said: "We saw a fairly consistent stream of snow showers overnight, and there will be a constant feed throughout the day and into Friday".
One Twitter user wrote: Storm Caroline approaching, danger to life, take care our snowman has already been blown over and injured? "More broadly across Scotland there will be 60mph-70mph gusts, but in exposed areas we could see 90mph".
A covering of snow can be expected in some low-level areas, especially for northern and north-western counties where several centimeters is possible.
Highways England issued advice for drivers travelling through the north west and north east of England and the Midlands to check the forecast and road conditions before they travel.
"Rural communities with limited access routes could become cut off".
Heaviest snow showers will be confined to northeast Scotland as Saturday draws to a close.
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Warnings of snow, ice and wind have been issued for many parts of the United Kingdom, with forecasters saying road, rail and air travel may be disrupted on Friday.
"Significant accumulations" in Wales and the West Midlands are also expected, says the Met Office, which has put Wolves' Sky Bet Championship game against Sunderland in doubt, with staff and fan volunteers welcomed in to help clear the stadium of snowfall.
Snow showers affecting Scotland, Northern Ireland and northern England are expected to extend across Wales and central and western England overnight.
If the satellite imagery is anything to go by, then the United Kingdom will get shafted pretty hard by the storm too, with the Met Office issuing warnings of their own.
It warned of "possible delays and cancellations to rail and air travel".
Flights and ferry services were cancelled while dozens of schools were closed across the north of the country.